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A nice white(ish) sand meant for freshwater aquariums would be best IMO

I would think the best approach to stocking your tank would be based on the size of the aquarium and your water parameters of your tap water.

If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease."Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony CalfoFishless CycleCycling with FishMarine Aquarium Info [URL="http://saltwater.aquaticcommunity.com/"]

1) is Crushed coral ok for freshwater tank?
2) how bad will it raise my PH?
3) is it HARD to clean?
4) Can i OLNLY have African Chicllids in the tank now?

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1. Sort of. It's sharp and causes the water hardness to skyrocket.
2. Don't think it will go beyond 9. It will massivly increase the water hardness.
3. Not really
4. No, you can also some central American cichlids.

I'd avoid it because it's next to useless for most freshwater setups and because I personally try to avoid any products that are made of coral

Crushed coral is perfect for Rift Lake cichlids (Lake Malawi, Lake Tanganyika, Lake Victoria). It can also be used with other hard-water-loving species such as mollies, guppies, and some rainbowfish - although these species prefer planted set-ups which crushed coral is not ideal for.

If you are not looking to set up an African tank - go for pool filter sand instead.